Let $F/K$ be a field extension with $[F: K]$ finite and let $K[x]$ be the ring of polynomials in $x$ with coefficients in $K$.
The minimal polynomial of $\alpha\in F$ over $K$ is the monic polynomial $P(x)\in K[x]$ of least degree with $P(\alpha)=0$.
"Monic" means that $P(x)$ has leading coefficient equal $1$.
Let $(P(x))$ be the ideal in $K[x]$ generated by $P(x)$.
Which of the following is NOT a property of the minimal polynomial $P(x)$ of $\alpha\in F$ over $K$?